A video acoustical method determines an impact point of a thrown body on a landing area, in particular for athletics throws disciplines, the body describing a trajectory in the air from a take-off area towards the landing area, the impact point being defined by the body hitting on the landing area. The method includes acquiring video exposures of the body impact on the landing area to a frame rate, each exposure showing one position of the body; calculating the body trajectory during at least the body impact on the landing area with the video exposures analysis; detecting an acoustical impact time due to the body hitting on the landing area; and determining the body impact point on the calculated trajectory with the detected acoustical impact time. A video acoustical system can determine an impact point of a thrown body on a landing area.

A training aid stimulator for providing fast perceptive feedback is provided. The training aid stimulator includes a first skin electrode for making electrical contact to the body of a user and a second skin electrode for making electrical contact to the body of a user. A body capacitance charging module is connected to the first skin electrode and a discharge module is connected to the second skin electrode for a feedback discharging of a body capacitance. A processor is connected to the body capacitance charging module for controlling the charging of a body capacitance to a predetermined first voltage level, wherein the processor is connected to the discharge module for controlling a feedback discharge of the body capacitance. The stimulator further comprises a measurement module for measuring the level of charge of the body capacitance.

An adjustable weight shot system may include a core, inner and outer weight portions, and a body and cap. The inner weight portion may have two coupling hemispheres configured to receive the core in an inner weight portion cavity. Or the inner weight portion may be a hollow cylindrical portion configured to receive the core. The outer weight portion may have two coupling hemispheres configured to receive the inner weight portion in an outer weight portion cavity. Or the outer weight portion may be a hollow cylindrical portion configured to receive the inner weight portion. The body and cap may be configured to retainer the outer weight portion in a weight cavity defined by the body and cap.

A training aid stimulator for providing fast perceptive feedback, the training aid stimulator comprising a first skin electrode for making electrical contact to the body of a user, and a second skin electrode for making electrical contact to the body of a user, a body capacitance charging module connected to the first skin electrode, a discharge module connected to the second skin electrode for a feedback discharging of a body capacitance, and a processor connected to the body capacitance charging module for controlling the charging of a body capacitance, C.sub.BODY, to a predetermined first voltage level, wherein the processor further being connected to the discharge module for controlling a feedback discharge of said body capacitance, C.sub.BODY, and wherein the stimulator further comprises a measurement module for measuring the level of charge of said body capacitance, C.sub.BODY.

A system for locating an electronic game implement such as an electronic golf ball. The electronic game implement has an outer shell and internal core, with the core containing graphene coated electronics and a battery, wherein the associated electronics of the electronic game implement includes a processor and transceiver configured to measure data including acceleration, speed, travel trajectory and final location while also being configured to transmit the measured data via a communications protocol. The ball or sports game implement that includes the associated electronics are also an embodiment of the invention. The system includes a smart device having associated electronics to communicate with the electronic game implement ball, with the associated electronics of the smart device including a processor configured to receive the measured data from the electronics of the electronic game implement.

A video acoustical method determines an impact point of a thrown body on a landing area, in particular for athletics throws disciplines, the body describing a trajectory in the air from a take-off area towards the landing area, the impact point being defined by the body hitting on the landing area. The method includes acquiring video exposures of the body impact on the landing area to a frame rate, each exposure showing one position of the body; calculating the body trajectory during at least the body impact on the landing area with the video exposures analysis; detecting an acoustical impact time due to the body hitting on the landing area; and determining the body impact point on the calculated trajectory with the detected acoustical impact time. A video acoustical system can determine an impact point of a thrown body on a landing area.

A weight-balanced apparatus, comprising: a main body shaped substantially like a hollow sphere with spherical caps removed in a same central axis of the body to create two opposing openings sized to account for the natural motion of a user's arm during exercise and where the main body is balanced in each of at least three dimensions from a center point of the sphere, wherein each of the two opposing openings have a continuous, rotationally symmetric beveled edge around the opening; and, a hand hold traversing centrally through the hollow of the spherical main body through the center point and transverse to the central axis.

An assembly and method for a variable weight shot put assembly. The assembly maintains its size while its total weight can be altered by the user as the user trains. The assembly includes a sphere, the shot put, which splits into at least two portions. Slugs are placed in various inner cavities located within the sphere. Slugs have different set weights and weights are placed in the inner cavities so that the sphere maintains its original center of gravity.

A weight-balanced apparatus, comprising: a main body shaped substantially like a hollow sphere with spherical caps removed in a same central axis of the body to create two opposing openings sized to account for the natural motion of a user's arm during exercise and where the main body is balanced in each of at least three dimensions from a center point of the sphere, wherein each of the two opposing openings have a continuous, rotationally symmetric beveled edge around the opening; and, a hand hold traversing centrally through the hollow of the spherical main body through the center point and transverse to the central axis.